gruntwork-io/terratest

DevOps Exercises is a GitHub repository collecting 2624 questions and exercises spanning Linux, networking, Kubernetes, Terraform, and cloud platforms, written as plain markdown Q&A with no app or course wrapped around it.

act is a command-line tool that runs the workflows in a repo's .github/workflows/ folder on your own machine instead of on GitHub's servers. It calls Docker's API to fetch or assemble the images a workflow needs and runs each job in a container set up to mirror GitHub's environment variables and filesystem, per the README, so you get fast feedback on a workflow edit without committing and pushing, or can use the same workflow definitions as a local task runner instead of a Makefile.

trimstray/the-book-of-secret-knowledge is a highly-starred GitHub repository offering a curated collection of resources for system and network administrators, DevOps, pentesters, and security researchers, though it aims to be useful for everyone. It compiles inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, and CLI/web tools, organized into main chapters such as CLI Tools, GUI Tools, Systems/Services, Networks, Hacking/Penetration Testing, and Shell One-liners. The project emphasizes quality over quantity, welcoming contributions that are inviting, clear, not tiring, and useful, with an active RSS feed for updates.

Ollama is a Go-based CLI and local server for running open large language models — Llama, Gemma, Qwen, DeepSeek, and more — on your own hardware. It wraps the llama.cpp inference engine, exposes a REST API on port 11434, and ships official Python and JavaScript clients so apps can call a local model instead of a hosted one.